Hangouts brings one-on-one and group conversations to life with photos, emoji, and video calls for free. Connect with friends across computers, Android and Apple devices. Brought to you by Google. (Replaces Google Talk)

Empathy is a messaging program which supports text, voice, and video chat and file transfers over many different protocols. You can tell it about your accounts on all those services and do all your chatting within one application.

LINE is a new communication app which allows you to make FREE voice calls and send FREE messages whenever and wherever you are, 24 hours a day. LINE has more than 150 million users worldwide and is used in over 230 countries.

Ventrilo is the next evolutionary step of Voice over IP (VoIP) group communications software. Ventrilo is also the industry standard by which all others measure themselves as they attempt to imitate its features.